Advanced Composite Model Fitting notebook

[hcferguson]

Draft of notebook from @ibusko , annotated and partially revised by @hcferguson to use some of the SpecUtils machinery.

[eteq]

I pushed up a few commits to fix the dependencies, and I think the build is now working. @hcferguson, can you confirm that https://26-126393017-gh.circle-artifacts.com/0/root/repo/jdat_notebooks/composite_model_fitting/specfit_demo_3.html looks the way you think it should look for this notebook?

[eteq]

Oh and one clarifying question for @hcferguson: in the requirements file you specified == for your versions. Is that intended, or do you mean >=? I.e., you were specifying the version you are running on, but not saying that you know for sure it doesn't work on a more recent version.

(This also reveals that a bit more detail on what goes in the requirements file is called for in the README...)

[hcferguson]

The html rendering looks good to me.

Requirements >= should be fine. I was just mindlessly following the example.

[eteq]

Requirements >= should be fine. I was just mindlessly following the example.

Oh good point! I should change the example to be >=...

[eteq]

This LGTM now - thanks @hcferguson !